Injection stretch blow molded wide mouthed container for a paint container and the like

ABSTRACT

A wide mouthed container of synthetic resins for a paint, wax and the like, formed thinly in the body portion thereof by injection stretch blow molding is provided. A mouth portion of the wide mouthed container is of large diameter and comprises an internal wall integral with a body portion having a bottom, a belt shaped external wall integrally formed on the outside of the internal wall via a joint portion of required width to be in H-shape, and an upper and lower annular grooves between both the walls sectioned by the joint portion. The body portion is stretch blow molded thinly from the underside of the internal wall to a position where the lower edge of the external wall touches the body portion to form the side surface of the body portion on the same level as said external wall and to form the lower annular groove into a hollow in the lower part of the mouth portion. A plurality of ribs for preventing the deformation of the joint portion in stretching the body portion are integrally formed aslope onto a corner between the under surface of said joint portion at its external wall side and the inner surface of the external wall to provide a required number of the ribs in the lower annular groove at a regular interval.

TECHNICAL FIELD

The present invention relates to a wide mouthed container of syntheticresins for paint, wax and the like, formed thinly in the body portionthereof by injection stretch blow molding.

BACKGROUND ART

In a wide mouthed container for paint, wax and the like, a mouth portionthereof comprises an external wall and an internal wall that is formedto be lower than and on the inside of the external wall past an annulargroove. A lid is fitted to an inner side surface of the mouth portionformed by the internal wall, and a rim of the lid is fitted to theinside of the external wall, so that the container is kept sealed. Thelid can be easily removed by inserting a tip of a screwdriver and thelike between the external wall and the rim of the lid, and pushing downa grip of the screwdriver supported at the external wall.

Conventionally, most of such wide mouthed containers with adouble-walled mouth portion are made of metal, but those of syntheticresins are newly manufactured by employing the injection molding method,injection blow molding method and the like. However, such moldedarticles cannot be thinly formed in the body portion thereof, and arepoor in strength as compared with those of metals, which gives rise to aproblem in that they are easily broken when dropped.

Approaches to the problem are made in which paint containers and thelike are manufactured by employing the injection stretch blow moldingmethod that enables resins to be reinforced by biaxial stretching. Apaint container disclosed in WO97/19801 is manufactured by the steps of:injection molding a preform consisting of a large-diameter mouth portioncomprising a belt shaped external wall and an internal wall which isformed to be lower than and on the inside of the external wall via ajoint portion past an annular groove, and a body portion having a bottomwhich is molded extending from the underside of the internal wall;transferring the preform to a blow mold for molding a paint container;and stretch blowing the preform below the body portion thereof from theunderside of the internal wall.

In the disclosed injection stretch blow molding, the external andinternal walls of the mouth portion cooled and solidified are heldbetween a mouth forming mold and a core mold while heated portions belowthe body portion thereof is axially stretched. At almost the same time,the body portion is also air blown to a skirt portion which isprojectingly formed on the underside of the external wall, so that theunstretched joint portion and an upside of the body portion which isblown and stretched into shoulder-shape are integrated.

In a paint container according to the ways described above, the bodyportion and bottom thereof are thin and biaxially oriented by thestretch blowing. Therefore, as compared to those manufactured byinjection molding or injection blow molding, such a container is lightin weight and improved in falling strength, and may be improved in gasbarrier capability depending on the material resins.

However, in the stretch blowing according to the aforesaid prior art, nosupporting part for the aforesaid joint portion is provided between theskirt portion and the internal wall; therefore, axial tensile stressesconcentrate to the joint portion in stretch blowing, the joint portionis drawn downwardly from a corner of the skirt portion and deformed, andstrains occur in the internal wall. This gives rise to a problem in thatthe molding accuracy is decreased in a mouth end edge and an innersurface of the internal wall which are to be a fitting edge and an innerside surface of the mouth portion, and thus the fit with the lid isdeteriorated and the sealing capability lost.

As the span of the joint portion gets longer, the strains in theinternal wall caused by the axial stretching come to the front. This canbe improved by reducing the span, which, however, limits the radialexpansion of the body portion. Thereby the body portion is formedthicker in the upper part thereof and thinner in the lower, resulting inunevenness of the wall thickness, which lowers the buckling strength ofthe body portion. In such cases, containers at the bottom may bedeformed by load when a plurality of containers are piled up.

Like an injection blow molded paint container disclosed in the JapanesePatent Laid-Open Publication No. Sho 57-77439, ribs may be provided tosupport the joint portion. However, such ribs as described therein beingformed across the external and internal walls cause a difference betweenribbed and non-ribbed portions in stretched state. As a result,irregularity tends to be induced on the inner surface of the internalwall to which a lid is fitted.

Since touching to and located between the external and internal walls,the ribs take time to be cooled and solidified completely enough forbearing the tensile stress. On the other hand, the preform has to bereleased from the molds while the portions below the body portion stillhave a required amount of heat for stretch blowing. Therefore, thesupport by providing the ribs has not always been an effective approachfor injection stretch blow molding.

Through the perpetual studies of the inventor of the present inventionconcerning the prevention of the aforesaid tensile deformation of theinternal wall caused by the axial stretch, it has been found that eventhough ribs are employed for supporting the joint portion, conventionaldefects can be avoided depending on the way of forming ribs. That is,even in a wide mouthed container such as an injection stretch blowmolded paint container, the inventor has found that it is possible toprevent the tensile deformation of the joint portion resulting from thestretching, as well as to avoid the convexo-concave deformation of theinner surface of the mouth portion caused by the conventional ribs andto finish the cooling and solidification of the ribs in a short periodof time.

It is thus an object of the present invention to provide an injectionstretch blow molded wide mouthed container of large diameter for a paintcontainer and the like in which the problem of the strains in theinternal wall resulting from the tensile deformation of the aforesaidjoint portion is solved by the introduction of the reinforcing meansusing small ribs, and, despite of being made of synthetic resins, thebody portion is formed thinly and is improved in falling strengthbecause of the biaxial orientation.

In addition, the present invention is to provide an injection stretchblow molded wide mouthed container of large diameter for a paintcontainer and the like in which the body portion and the external wallof the mouth portion are formed into side faces on the same level, likeconventional paint tins and the like. By this means, even if the radialexpansion of the body portion is limited, the employing of a preform ofcertain shape in cross-section allows the body portion to be moldedwithout irregular in wall thickness, thereby enabling a plurality of thewide mouthed containers to be piled up.

Furthermore, the present invention is to provide an injection stretchblow molded wide mouthed container of large diameter for a paintcontainer and the like in which a handle can be rotatably mounted acrossboth sides of the mouth portion by utilizing the external wall, and thelid can be prevented from popping-out caused by a reaction in removingthe lid, an increase in pressure inside the container, or the like.

DISCLOSURE OF THE INVENTION

The present invention according to the aforesaid objects is to provide awide mouthed container, in which: a mouth portion of large diameter iscomposed of an internal wall integral with a body portion having abottom, a belt shaped external wall integrally formed on the outside ofthe internal wall via a joint portion of required width to be inH-shape, and an upper and lower annular grooves between both the wallssectioned by the aforesaid joint portion; and the aforesaid body portionis stretch blow molded thinly from the underside of the internal wall toa position where the lower edge of the external wall touches the bodyportion to form the side surface of the body portion on the same levelas the aforesaid external wall and to form the lower annular groove intoa hollow in the lower part of the mouth portion, the wide mouthedcontainer comprising a rib for preventing the deformation of the jointportion in stretching the body portion, integrally formed aslope onto acorner between the under surface of the aforesaid joint portion at itsexternal wall side and the inner surface of the external wall, arequired number of the ribs provided in the lower annular groove at aregular interval.

In such a configuration, even if axial tensile forces acting on theinternal wall concentrate to the joint portion in stretch blowing, thejoint portion holds so as to prevent the internal wall from beingdistorted downwardly by the tensile forces since the joint portion issupported by the aforesaid ribs at a regular interval. Therefore, theend edge of the internal wall suffers from no deformation, and keeps thesame horizontal accuracy as in the injection molding. The ribs arelocated on the external wall side apart from the internal wall, whichsolves the problem that the existence of a rib causes a difference instretched state of the internal wall and an irregularity occurs on theside surface of the internal wall to which a lid is fitted. In addition,the ribs are rapidly cooled and solidified along with the external wall,so that the mouth portion with the ribs will not take a long time to becooled.

In addition, the present invention is provided in which the container ismolded in such a manner that an injection molded preform comprising amouth portion of large diameter composed of an internal wall integralwith a body portion having a bottom, a belt shaped external wallintegrally formed on the outside of the internal wall via a jointportion having a required width to be in H-shape, and an upper and lowerannular grooves between both the walls sectioned by the aforesaid jointportion, is held at the aforesaid mouth portion provided by cooling andsolidifying, and the aforesaid body portion is stretch blown to the samelevel as the aforesaid external wall while a portion from the undersideof the aforesaid internal wall to the body portion is in hightemperatures.

The aforesaid preform comprises the body portion extending from theaforesaid internal wall in which the body portion is composed of athick-walled planiform stretch expanded portion of corn shape and arecess of required diameter formed at the center of the aforesaidpreform by outwardly projecting a top portion of the stretch expandedportion, the bottom surface of the recess is formed to be nearly flatand thin, and the stretch expanded portion on the periphery of therecess is formed to curve inwardly.

In the preform, a top portion of a stretch rod is set into the aforesaidrecess and expanded to press the bottom, so that the stretch expandedportion in heated state is stretched from a hem of the internal wall tobe thinned. Therefore, a wide mouthed container with generally uniformthickness in the body portion can be obtained although the radialexpansion of the body portion is limited to the position of the externalwall.

The present invention is also provided in which mounting holes areformed at symmetrical positions on the external wall in the molding ofthe aforesaid preform, and fitting tabs projectingly provided on theinner sides of both end portions of a flexible corded handle arerotatably fitted and locked into the mounting holes respectively tomount the aforesaid handle across both sides of an opening portion.Here, the aforesaid fitting tabs are of tablet shape and comprise asemicircular locking block on the upside of the tip thereof, and the endportions of the handle and the fitting tabs comprise a slit extendingfrom the lower end to the central portion thereof. The slits allow theend portions of the handle and the fitting tabs to be reduced in size toinsert the fitting tabs along with the locking blocks into the aforesaidmounting holes rotatably, so that the aforesaid locking blocks arehooked and set inside the external wall.

Moreover, the present invention is provided in which a projection forlatching is projectingly provided on a rim of a lid and is inserted intoa fitting hole provided in a side surface of the external wall to closethe lid, thereby preventing the lid from popping-out caused by areaction in opening.

Furthermore, the present invention is provided in which a rim of a lidof synthetic resins is formed largely in diameter to extend over a mouthend edge of the external wall and is shaped into a fitting groove sothat the lid can be fitted both to the inner surface of the internalwall and to the mouth end edge of the external wall, an engaging edge isformed on the outside of the mouth end edge of the external wall, and asecondary fitting provided between the engaging edge and an annulargroove formed in the inside of the aforesaid fitting groove prevents thelid from self-opening resulting from a looseness of the fitting with theinner surface of the mouth portion caused by the internal pressure ofthe paint container. Here, an air vent is also provided in the aforesaidexternal wall for discharging gas leaked out on account of the loosenedfit of the aforesaid lid with the inner surface of the mouth portion soas to reduce the inside volume of the paint container, so that thesealing resulting from the fit with the inner surface of the mouthportion is restored.

BRIEF EXPLANATION OF THE DRAWINGS

FIG. 1 is a longitudinal sectional view of a stretch blow molded widemouthed container according to the present invention.

FIG. 2 is an enlarged sectional view of an essential portion of astretch blow molded wide mouthed container according to the presentinvention.

FIG. 3 is a longitudinal sectional view of a preform of a stretch blowmolded wide mouthed container according to the present invention.

FIG. 4 is a bottom plan view of the preform.

FIG. 5 is a sectional view of a preform of a stretch blow molded widemouthed container according to the present invention in molding a paintcontainer, where dashed lines show the preform under the stretchblowing.

FIG. 6 is an enlarged partially sectional view of a mouth portion of astretch blow molded wide mouthed container according to the presentinvention.

FIG. 7 is a front view of a paint container with a handle according tothe present invention, where dashed lines show the piled state thereof.

FIG. 8 is a side view of a paint container with a handle according tothe present invention.

FIG. 9 is a partially cutaway plan view of a paint container with ahandle according to the present invention;

FIG. 10 is a partially longitudinal sectional view of a mouth portionshowing the mounting state of a handle and the fitting state of a lid atits rim according to the present invention.

FIG. 11 is a partially longitudinal sectional view of a mouth portionwith a lid having fitting means to a mouth end edge of an external wall.

BEST MODE FOR CARRYING OUT THE INVENTION

A wide mouthed container shown in FIG. 1 is a paint container molded ofpolyethylene terephthalate (PET). A large-diameter mouth portion 1comprises an internal wall 3 integral with a body portion 2 having abottom, a belt shaped external wall 4 integrally formed on the outsideof the internal wall 3 via a joint portion 5 of required width to be inH-shape, and an upper and a lower annular grooves 7 and 8 between boththe walls 3 and 4 sectioned by the joint portion 5. The external wall 4is formed taller than the internal wall 3. A projection 6 is integrallymolded on the outside of an end edge of the external wall 4.

The aforesaid body portion 2 is stretch blow molded thinly (about 0.5mm) and vertically from the underside of the internal wall 3 to aportion where the side surface of the body portion 2 reaches to andbecomes at the same level as the external wall 4. By this means, thelower annular groove 8 is formed into a hollow in the underside of themouth portion 1, a pedestal 11 of a diameter smaller to some extent thanthe internal wall 4 is projectingly molded on a bottom portion 10extending from the body portion 2, and thus the wide mouthed paintcontainer is formed.

Designated by 9, 9 are ribs for supporting the joint portion 5, eight ofwhich are provided in the aforesaid lower annular groove 8 at a regularinterval in this embodiment. The ribs 9 are integrally formed aslope oncorners between the under surface of the joint portion 5 on the externalwall side and the inner surface of the external wall 4, apart from theinternal wall 3, so as to prevent the deformation of the joint portion 5in stretching the body portion.

In a paint container of such configuration, as shown in FIG. 2, a lid 30is fitted into the inside of the internal wall 3 like well-known painttins, and a rim 30 a of the lid 30 is received by a mouth end edge 3 aof the internal wall 3, so that the lid 30 is set inside the externalwall 4.

FIG. 3 shows a preform 12 of the aforesaid paint container. The mouthportion 1 of the paint container is injection molded in advance as amouth portion 13 of the preform 12 of the same structure along with abottomed body portion of the preform 12 extending from the internal wall3. The body portion of the preform is composed of a thick-walledplaniform stretch expanded portion 14 of corn shape, and a recess 16 ofrequired inner diameter formed at the center of the preform byprojecting a top portion 15 of the stretch expanded portion outwardly.The recess 16 is formed to be thin and nearly flat at its bottom surface17, and to curve inwardly at its stretch expanded portion 14 a (seeFIGS. 4 and 5) on the periphery of the recess 16.

The preform 12 is released from an injection mold while portions fromthe underside of the internal wall 3 to the stretch expanded portion 14are still in heated state. Up to this time, the mouth portion 13 of thepreform is cooled and solidified. Accordingly, as shown in FIG. 5, withthe mouth portion 13 held at its outside with a mouth forming mold 18used in the injection molding, the preform is transferred to a blow mold19 before a blow core 20 is fitted to the internal wall 4. Here, withthe previously solidified mouth portion 13 of the preform held betweenthe blow core 20 and the mouth forming mold 18, the preform is stretchblow molded into a wide mouthed container.

The stretch blow molding is performed in such a manner that: a topportion 22 of a stretch rod 21 equipped in the blow core 20 is set intothe recess 16; the center portion of the preform is pressed downwardlywith the stretch rod 21 so as to extend the body portion of the preformaxially from the underside of the internal wall 3; and, almost at thesame time, the stretch expanded portion 14 is expanded radially by airblowing.

In the preform 12, an upper part of the stretch expanded portion 14 isstretched to be slightly thinner by the expansion of the aforesaidstretch rod 21. The thinning of the wall lowers the temperature of thepart, so that the stretch is shifted to an unstretched portion below.After this manner, the expanded portion 14 a on the periphery of therecess 16 curving inward is stretched, and the body portion of thepreform is changing into an elongated truncated corn shape. Here, thedistance of the body portion of the preform from a cavity surface of theblow mold 19 increases as approaching to the bottom, which makes adifference in radial stretch ratio at the upper and lower parts.However, the difference is cancelled to some extent by the wallthickness, so that the body portion 2 of the paint container isprevented from the unevenness in wall thickness.

Accordingly, even in a paint container that tends to be limited inradial stretch expansion more tightly and formed thicker in upper parts,the body portion 2 expanded and formed thinly from the internal wall 3to a portion where to meet with he under edge of the external wall 4 isevened in wall thickness distribution and improved in buckling strength.

The stretch blow molding may be favorably performed before the surfacetemperature of the stretch expanded portion 14 in heated state reachesits peak temperature by the internal heat.

Moreover, in the axial stretch by the stretch rod 21, the mouth portion13 of the preform is previously solidified and is held between the mouthforming mold 18 and the blow core 20. On the other hand, the internalwall 3 is held only at one side against the blow core 20, merely by flatcontact, differing from the external wall 4 which is held by the fittingof a projecting edge 6. Therefore, the downward tensile force causes aslip in the internal wall 3, resulting in the concentration of stressesto the aforesaid joint portion 5.

However, the tensile stresses are partially dispersed to the externalwall 4 via the aforesaid ribs 9, 9 formed on the corners between thejoint portion 5 and the external wall 4. The ribs 9, 9 also enable thejoint portion 5 to resist against the tensile force. As a result, thestrain in the internal wall 3 caused by the joint portion 5 is deterred,the inner surface of the mouth portion formed of the internal wall 3 andthe mouth end edge 3 a of the stretch blow molded paint container areprevented from deformation, and the shape and the horizontal accuracythereof are kept assured as in the previous injection molding.

Furthermore, being provided in the lower annular groove 8, the ribs 9, 9for preventing the deformation differ from well-known ribs formed acrossthe internal and external walls 3 and 4 in that they are easily cooledalong with the external wall 4 because of being isolated from theinternal wall 3. In addition, the ribs cause no irregular deformation ofthe inner surface since they are not in touch with the internal wall 3.

Moreover, the lower annular groove 8 of the joint portion 5 is leftclosed with the blow molded body portion 2 to form a hollow after themolding. However, the aforesaid ribs 9, 9 in the hollow reinforce theexternal wall 4 against external force, so that the strain in theexternal wall 4 by external force is deterred, and the mouth portion 1is also prevented from the deformation by external force.

Accordingly, even though the wide mouthed container is of stretch blowmolded synthetic resins, no disorder occurs in molding accuracy of theinjection molded mouth portion, so that a lid is freely fitted and apoor sealing hardly occurs. In addition, the biaxial orientation of thebody portion improves impact strength and gas barrier property, therebyenhancing its application for a wide mouthed container for a paint andthe like in which color of content is distinguishable from the outside.Furthermore, wide mouthed containers of the same configuration can bemanufactured from various synthetic resins as long as the resins areavailable for stretch blow molding, and thus be widely applied to widemouthed containers for volatile content.

FIGS. 7 to 10 show a case where a handle 23 is mounted to a paintcontainer by utilizing the aforesaid external wall 4. In molding theaforesaid preform 12, mounting holes 24, 24 are formed at symmetricalpositions on the external wall 4 by using projecting portions (notshown) provided in the mouth forming mold 18 of split molds. Fittingtabs 25, 25 projectingly provided on the inner sides of both endportions of the corded handle 23 of flexible synthetic resins(polypropylene, for example) are rotatably fitted and locked into themounting holes 24, 24, respectively.

The aforesaid fitting tabs 25, 25 are of tablet shape and have asemicircular locking block 26 on the upside of the tips thereof,respectively. The end portions of the handle and the fitting tabs 25have a slit 27 extending from their lower end to the center. The slits27 enable the fitting tabs 25 along with the end portions of the handleto be pressed and reduced in size so that the locking blocks 26 can beupwardly slantly inserted into the mounting holes 24. In this manner,the locking blocks 26 are set in the aforesaid lower annular groove 8forming a hollow, and are retained inside the external wall 4. Note thatprovided concavely in the peripheral surface of the external wall 4 is aretention groove 28 for use in the stretch blowing.

The. bottom of the paint container may be formed into a step portion 2 ain the periphery thereof, as shown in FIG. 7, in stead of the aforesaidpedestal 11. Here, the step portion 2 a is provided with an outerdiameter smaller to some extent than the inner diameter of the externalwall 4 so as to be set inside the external wall 4, and a bottomperiphery 2 b is provided with a proper height so as to ride on themouth end edge of the external wall 4. By this means, when a pluralityof the paint containers are piled up as shown in FIG. 7, respectiveloads thereof hold down the lids 30 of the paint containers below.Furthermore, even if the loads cause the distortion in the bodyportions, the external walls 4 can provide a support against fallingdown.

In FIG. 10, a projection 30 b for locking is projectingly provided on arim 30 a of the aforesaid lid 30 of synthetic resins, and a fitting hole29 for fitting the projection 30 b is provided in the side surface ofthe external wall 4. The lid 30 is closed with the projection 30 binserted into the fitting hole 29, and is opened by being unclenched atthe opposite side to the projection 30 b. This prevents the lid 30 frompopping-out caused by a reaction in opening.

In such a configuration, the external wall 4 is molded higher than theinternal wall 3 by the width of the fitting hole 29, and the lid cannotbe opened with a screwdriver and the like by using the mouth end edge ofthe external wall 4 as the fulcrum. Therefore, a notch 31 for lidopening is formed in the edge opposite the fitting hole 29, as shown inFIG. 9. The notch 31 is not limited to the aforementioned position, anda plurality thereof may be provided.

In FIG. 11, the lid 30 of synthetic resins is provided in which the rim30 a thereof is formed largely in diameter to extend over a mouth endedge of the external wall 4 and is shaped into a fitting groove 30 c sothat the lid can be fitted both to the inner surface of the internalwall 3 and to the mouth end edge of the external wall 4. An engagingedge 32 is formed on the outside of the mouth end edge of the externalwall 4. In a case where an evaporated solvent resulting from hot air andthe like causes a rise in the internal pressure of the paint containerand loosens the fit of the lid to the inner surface of the mouthportion, the lid 30 may open by itself. However, a fit between the rim30 a and the mouth end edge of the external wall 4 utilizing a secondaryfit provided between the aforesaid engaging edge 32 and an annulargroove 30 d formed in the inside of said fitting groove 30 c preventsthe lid 30 from opening and popping-out.

In addition, an air vent 33 is provided in the external wall 4 so that,when an increase in the internal pressure loosens the fit with the innersurface of the mouth portion and causes the evaporated gas to leak out,the air vent 33 discharges the gas and reduces the internal pressure torestore the seal resulting from the fit with the inner surface of themouth portion.

INDUSTRIAL APPLICABILITY

As described above, in an injection stretch blow molded wide mouthedcontainer of large diameter for a paint container and the like accordingto the present invention, a solution to the strains and the like in theinternal wall resulting from the tensile deformation of the aforesaidjoint portion is provided by the introduction of the reinforcing meansusing small ribs. In addition, the body portion is formed thinly and isimproved in falling strength because of the biaxial orientation.

Moreover, in the wide mouthed container according to the presentinvention, the employing of a preform of certain shape in cross-sectionenables the body portion to be molded without irregular in wallthickness, and thereby enabling a plurality of the wide mouthedcontainers to be piled up.

Furthermore, in the wide mouthed container according to the presentinvention, a handle can be rotatably mounted across both sides of themouth portion by utilizing the external wall. Besides, the lid can beprevented from popping-out caused by a reaction in removing the lid, anincrease in pressure inside the container or the like.

What is claimed is:
 1. An injection stretch blow molded wide mouthedcontainer for a paint container and the like wherein a mouth portion oflarge diameter thereof comprises an internal wall integral with a bodyportion having a bottom, a belt shaped external wall integrally formedon the outside of the internal wall via a joint portion of requiredwidth to be in H-shape, and an upper and lower annular grooves betweenboth the walls sectioned by said joint portion, and said body portion isstretch blow molded thinly from the underside of the internal wall to aposition where the lower edge of the external wall touches the bodyportion to form the side surface of the body portion on the same levelas said external wall and to form the lower annular groove into a hollowin the lower part of the mouth portion, said wide mouthed containercomprising a rib for preventing the deformation of the joint portion instretching the body portion, integrally formed aslope onto a cornerbetween the under surface of said joint portion at its external wallside and the inner surface of the external wall, a required number ofthe ribs provided in the lower annular groove at a regular interval. 2.An injection stretch blow molded wide mouthed container for a paintcontainer and the like according to claim 1, wherein said container ismolded in such a manner that an injection molded preform comprising amouth portion of large diameter composed of an internal wall integralwith a body portion having a bottom, an external wall of belt shapeintegrally formed on the outside of the internal wall via a jointportion of required width to be in H-shape, and an upper and lowerannular grooves between both the walls sectioned by said joint portion,is held at said mouth portion provided by cooling and solidifying, andsaid body portion is stretch blown to the same level as said externalwall while a portion from the underside of said internal wall to thebody portion is in high temperatures.
 3. An injection stretch blowmolded wide mouthed container for a paint container and the likeaccording to claim 2, wherein said preform comprises the body portionextending from said internal wall, the body portion is composed of athick-walled planiform stretch expanded portion of corn shape and arecess of required inner diameter formed at the center of said preformby outwardly projecting a top portion of the stretch expanded portion;the bottom surface of the recess is formed to be nearly flat and thin;and the stretch expanded portion on the periphery of the recess isformed to curve inwardly.
 4. An injection stretch blow molded widemouthed container for a paint container and the like according to claim1, wherein mounting holes are formed at symmetrical positions on theexternal wall in the molding of said preform; and fitting tabsprojectingly provided on the inner sides of both end portions of aflexible corded handle are rotatably fitted and locked into the mountingholes respectively to mount said handle across both sides of an openingportion.
 5. An injection stretch blow molded wide mouthed container fora paint container and the like according to claim 4, wherein saidfitting tab is of tablet shape and comprises a semicircular lockingblock on the upside of the tip thereof; the end portions of the handleand the fitting tabs comprise a slit extending from the lower end to thecentral portion thereof; and the slits allow the end portions of thehandle and the fitting tabs to be reduced in size to insert the fittingtabs along with the locking blocks into said mounting holes rotatably,so that said locking blocks are hooked and set inside the external wall.6. An injection stretch blow molded wide mouthed container for a paintcontainer and the like according to claim 1, said container furthercomprises a lid, wherein a projection for latching is projectinglyprovided on a rim of the lid, and is inserted into a fitting holeprovided in a side surface of the external wall to close the lid,thereby preventing the lid from popping-out caused by a reaction inopening.
 7. An injection stretch blow molded wide mouthed container fora paint container and the like according to claim 1, comprising aconfiguration in which: a rim of a lid of synthetic resins is formedlargely in diameter to extend over a mouth end edge of the external walland is shaped into a fitting groove so that the lid can be fitted bothto the inner surface of the internal wall and to the mouth end edge ofthe external wall; an engaging edge is formed on the outside of themouth end edge of the external wall; and a secondary fit providedbetween the engaging edge and an annular groove formed in the inside ofsaid fitting groove prevents the lid from self-opening resulting from alooseness of the fitting with the inner surface of the mouth portioncaused by the internal pressure of the container.
 8. An injectionstretch blow molded wide mouthed container for a paint container and thelike according to claim 7, comprising an air vent provided in saidexternal wall for discharging the gas leaked out on account of theloosened fit of said lid with the inner surface of the mouth portion soas to reduce the content of the paint container so that the sealingresulting from the fit with the inner surface of the mouth portion isrestored.